Procedural Sedation

Procedural Sedation

What is Procedural Sedation?

  • A technique of administering sedative or dissociative agents with or without analgesics.

  • Allows patients to tolerate unpleasant procedures while maintaining cardiorespiratory function.

  • Results in a depressed level of consciousness while enabling patients to maintain independent oxygenation and airway control.

Levels of Sedation

Continuum of Sedation

Minimal Sedation

  • Drug-induced state with normal response to verbal commands.

  • Cognitive function and coordination may be impaired, but ventilatory and cardiovascular functions remain unaffected.

Moderate Sedation (Conscious Sedation)

  • Drug-induced depression where patients respond purposefully to verbal commands or light tactile stimulation.

  • No interventions are required to maintain patent airway; spontaneous ventilation is adequate.

  • Cardiovascular function is usually maintained.

Deep Sedation

  • Patients cannot be easily aroused but respond purposefully to repeated or painful stimulation.

  • Ability to maintain ventilatory function may be impaired; assistance in maintaining patent airway may be needed.

  • Spontaneous ventilation may be inadequate; cardiovascular function is usually maintained.

General Anesthesia

  • Loss of consciousness; patients are not arousable, even with painful stimulus.

  • Often requires assistance in maintaining airway; positive pressure ventilation may be necessary.

  • Cardiovascular function may be impaired.

Dissociative Sedation

  • A trance-like state with profound analgesia and amnesia while retaining airway reflexes.

  • Uses ketamine as the pharmacologic agent.

Visual Representation of Sedation Levels

  • Comparison of Levels of Sedation

    • Minimal Sedation: Normal response, unaffected airway.

    • Moderate Sedation: Purposeful response; adequate spontaneous ventilation.

    • Deep Sedation: Purposeful response after stimulation; may require intervention for airway maintenance.

    • General Anesthesia: No response; intervention required.

Ramsay Sedation Scale (RSS)

Score Responses

  • 1: Anxious, restless, or both.

  • 2: Cooperative, oriented, tranquil.

  • 3: Responding to commands.

  • 4: Brisk response to stimulus.

  • 5: Sluggish response to stimulus.

  • 6: No response.

  • RSS Levels

    • 1, 2, 3 = Awake

    • 4, 5, 6 = Asleep

Risks of Procedural Sedation

  • Airway and breathing adverse events.

  • Chemical sedation complications:

    • Oropharyngeal soft tissue collapse

    • Head/neck malpositioning

    • Laryngospasm

    • Hypoventilation and loss of airway reflexes

    • Hypoxia, airway secretions, assisted ventilation, gastric insufflation, aspiration

Goals of Procedural Sedation

  • Too Little Sedation:

    • Leads to patient discomfort and lack of cooperation.

  • Too Much Sedation:

    • Risks cardiac or respiratory depression.

Procedural Sedation Basics

Monitoring Goals

  1. Patient safety is the priority.

  2. Constant monitoring:

  • Patient's breathing, sedation, analgesia, and anxiolysis.

  1. Minimize adverse psychological responses to pain.

  2. Patient must return to a safe state for discharge.

  3. Use of waveform capnography.

Pre-Procedural Checklist

  • Patient history and physical exam.

  • Obtain informed consent.

  • Ensure airway rescue equipment is prepared.

  • Administer medications appropriately.

Initial and Titration Doses

  • Midazolam: 1-2 mg IV; titrate as needed.

  • Fentanyl: 1-5 mcg/kg IV; titrate accordingly.

  • Propofol: 0.5-1 mg/kg IV; monitor closely.

  • Ketamine: 1-2 mg/kg IV, additional 0.5 mg/kg as necessary.

Equipment Required

  • CAS monitoring (ECG, NIBP, SpO2, EtCO2).

  • Supplemental Oxygen, self-inflating BVM.

  • Airway management tools (OPA, NPA, Laryngoscope, ETT, Supraglottic Airway).

  • Suction equipment.

Characteristics of an Ideal Agent for Procedural Sedation

  • Predictable onset and offset.

  • Wide therapeutic window with hemodynamic stability.

  • Minimally affects respiratory function; no significant side effects like nausea or vomiting.

Choice of Drug

  • Available agents include:

    • Benzodiazepines

    • Opioids

    • Hypnotics

    • Inhalational Anesthetics

    • Alpha-2 Agonists

    • Co-administration practices like "Ketofol."

Ketofol

  • Combination of Ketamine and Propofol (1:1 or 0.5:1).

Potential Advantages

  • Synergistic effects, lower doses required.

  • Balanced side effects for optimal patient comfort.

Potential Disadvantages

  • Limited evidence on benefits over monotherapy.

Alpha-2 Agonist: Dexmedetomidine (Precedex®)

  • Potent in brain and spinal cord with rapid distribution.

Potential Advantages

  • Sedation without respiratory depression.

  • Can be beneficial in managing shivering and delirium.

Potential Disadvantages

  • Possible bradycardia and hypotension; may cause dry mouth.

Monitoring for Procedural Sedation

Patient Monitoring

  • Ensure airway patency and protection.

  • Monitor oxygenation and ventilation.

  • Regularly assess hemodynamics.